| A | B |
|---|
| Categorical frequency distribution | is used for data that can be placed in specific |
| Class | is where raw data value is placed into a quantitative or qualitative category |
| Class boundaries | separate one class in a grouped frequency distribution from another. The boundaries have one more decimal place than the raw data and therefore do not appear in the data. There is no gap between the upper boundary of one class and the lower boundary of the next class. The lower class boundary is found by subtracting 0.5 units from the lower class limit and the upper class boundary is found by adding 0.5 units to the upper class limit |
| Class midpoint | is the number in the middle of the class. It is found by adding the upper and lower limits and dividing by two. It can also be found by adding the upper and lower boundaries and dividing by two |
| Class width | is the difference between the upper and lower boundaries of any class. The class width is also the difference between the lower limits of two consecutive classes or the upper limits of two consecutive classes. It is not the difference between the upper and lower limits of the same class |
| Cumulative frequency | is the sum of the frequencies accumulated up to the upper boundary of a class in the distribution |
| Frequency | is a class then is the number of data values contained in a specific class |
| Frequency distribution | is the organization of raw data in table form, using classes and frequencies. |
| Frequency polygon | is a graph that displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes. The frequencies are represented by the heights of the points |
| Grouped frequency distribution | is used when the range of the data is large, and the data must be grouped into classes that are more than one unit in width |
| Histogram | is a graph that displays the data by using contiguous vertical bars (unless the frequency of a class is 0) of various heights to represent the frequencies of the classes |
| Lower class limit | represents the smallest data value that can be included in the class. |
| Ogive | is a graph that represents the cumulative frequencies for the classes in a frequency distribution |
| Open-ended distribution | is a frequency distribution with an open-ended class |
| Pareto chart | is used to represent a frequency distribution for a categorical variable, and the frequencies are displayed by the heights of vertical bars, which are arranged in order from highest to lowest |
| Pie graph | is a circle graph divided into pieces, each displaying the size of some related piece of information. Pie charts are used to display the sizes of parts that make up some whole |
| Raw data | is data collected in original form |
| Relative frequency graph | is the frequency divided by the total frequency. This gives the percent of values falling in that class |
| Stem and leaf plot | is a data plot that uses part of the data value as the stem and part of the data value as the leaf to form groups or classes |
| Time series graph | represents data that occur over a specific period of time |
| Ungrouped frequency distribution | is a frequency distribution of numerical data. The raw data is not grouped |
| Upper class limit | represents the largest data value that can be included in the class |
